Confined Magnon Modes and Anisotropic Exchange Interaction in Ultrathin Co Films 1st Edition by Ying Jiun Chen ISBN 9783832592059 3832592059

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Product details:
ISBN 10: 3832592059
ISBN 13: 9783832592059
Author: Ying Jiun Chen

Long description: A fundamental need in wireless communication and modern computer processors is to fabricate faster, smaller, and lower power-consumption circuits. A promising approach is the utilization of spin waves, or rather, magnons in ferromagnetic films. Quantum confinement in ultra-thin films permits the coexistence of several exchange-dominated magnon modes with terahertz-range frequencies and sub-nanometer length scales. By means of spin-polarized electron energy loss spectroscopy (SPEELS), these exchange-dominated terahertz magnons are directly probed in ultra-thin cobalt films on Ir(001), Cu(001) and Pt(111) single crystal surfaces. The dispersion relation of the quantized magnon modes depends particularly on the interatomic exchange interaction in individual layers. By tuning the exchange interaction, modes with opposite group velocities, and thus an opposite propagation direction of the wave packets, can be generated. Ab initio theoretical calculations as well as an analytical Heisenberg model reveal a spatial localization of the modes at the surface, interior, and interface of the film that opens an experimental access to the layer-dependent magnetic properties. In itinerant ferromagnets like cobalt the magnetic properties depend sensitively on many-body correlation effects in the electronic structure. Here, it is shown for the first time that spin-dependent correlations lead to a pronounced renormalization of the energy of the highest magnon mode by up to 260 meV, explaining the significant overestimation of theoretically predicted magnon energies and interatomic exchange interaction found in literature

Confined Magnon Modes and Anisotropic Exchange Interaction in Ultrathin Co Films 1st Edition Table of contents:

Background

• Magnons in localized moment systems

  • The quasi-classical counterpart of a magnon

  • A magnon in quantum mechanics

  • Magnons in thin ferromagnetic films

• Stoner excitations in itinerant-electron ferromagnets

• Electron scattering

  • Low-energy inelastic electron scattering

  • Spin-dependent effects in elastic electron scattering

Experimental techniques

• Spin-polarized electron energy loss spectroscopy

  • Spin polarized inelastic electron scattering

  • Principles of SPEELS

• The experimental setup

  • The ultra high vacuum system

  • SPEEL-spectrometer

  • The GaAs-photocathode

Results

• The Co/Ir(001) system

  • Sample preparation and characterization

  • MOKE measurements

  • SPEELS measurements

• The Co/Cu(001) system

  • SPEELS measurements

• The Co/Pt(111) system

  • Sample preparation and characterization

  • MOKE measurements

  • SPEELS measurements

Discussion

• Film structure and substrate dependence

  • “Acoustic” magnons in Co and Fe films

  • Confined magnon modes in the 3 ML Co films

• Confined magnon modes in the Heisenberg model

• Layer-dependent exchange parameters

• Impact of the electronic structure on the magnons

• The magnon lifetime

  • “Acoustic” magnons in Co and Fe films

  • Confined magnon modes

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Tags: Ying Jiun Chen, Confined Magnon Modes, Anisotropic Exchange, Interaction, Ultrathin Co Films